Apple on Monday released OS X Update 10.9.1, an update to Mavericks. It's available for download from the Mac App Store using Software Update. The new release makes fixes to Gmail handling and other changes to improve stability and compatibility, according to Apple.
WWDC will bring with it the first developer's looks at new versions of OS X and iOS; Apple VP Phil Schiller said so when the company announced WWDC's dates. According to Mark Gurman of 9to5Mac, OS X 10.9 will tout features geared toward "power users," among them better Spaces management for multi-monitor systems, tabbed browsing and more.